Epitrochoid Housing Wheel Engine Piston Configuration
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Solution Overview
Problem
The existing four-stroke cycle internal combustion Housing Wheel Engine based on hypotrochoid systems is limited to engines with 6 or more pistons due to kinematic constraints, and faces challenges with housing wheel seals in harsh environments, including high friction, temperature, and pressure, which affects gas tightness and engine stability.
Innovation Solution
The engine design is modified to utilize an epitrochoid system with a fixed annular gear and rolling gears, incorporating an integral housing wheel, anti-centrifugal system, and vibration balance system to support a range of engine dimensions, separate intake and exhaust valves, and replace traditional housing wheel seals with piston-rings, addressing the limitations of the hypotrochoid system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hypotrochoid system is used with rolling circles inside a fixed circle, then the engine can achieve four-stroke cycle operation, but the engine is limited to 6 or more pistons (Rr≥3) due to kinematic constraints
Solution Approach 1:
The patent inverts the traditional hypotrochoid configuration by placing rolling gears outside the fixed annular gear instead of inside. This epitrochoid system allows the rolling gears to orbit around the fixed gear externally, fundamentally changing the kinematic relationships and enabling engine configurations with fewer pistons while maintaining the four-stroke cycle operation.
Solution Approach 2:
The patent changes the trochoid radius ratio parameter Rr to allow values of 1 and 2, which were previously excluded in hypotrochoid systems. By modifying the fundamental geometric parameters of the gear system and allowing Rr∈{1,2,3,...}, the engine can now be configured with 2, 4, 6, or more pistons, significantly increasing design flexibility.
2Device complexity
If traditional housing wheel seals are used in the hypotrochoid system, then the engine structure is simpler, but the seals face harsh environments with high friction, temperature, and pressure affecting gas tightness
Solution Approach 1:
The patent extracts the sealing function from the traditional housing wheel seal and relocates it to piston rings on individual pistons. This separation removes the harsh environmental conditions (high friction, temperature, and pressure) from the seal system by placing seals at the piston-cylinder interface where conditions are more manageable, while maintaining gas tightness.
Solution Approach 2:
The patent introduces piston rings as intermediary sealing elements between the combustion chamber and the external environment. These piston rings serve as a mediator that handles the sealing function under controlled conditions, protecting the main housing wheel from direct exposure to harsh thermal and mechanical stresses.
3Volume of moving object
If rolling gears are placed inside the fixed annular gear in a hypotrochoid system, then the engine achieves compact design, but the rolling gears occupy the space needed for main drive shaft
Solution Approach 1:
The patent inverts the spatial arrangement by positioning rolling gears outside the fixed annular gear. This external placement allows the main drive shaft to be positioned centrally and accessibly within the engine structure, eliminating the space conflict that existed in hypotrochoid systems where internal gear placement blocked drive shaft routing.
4Adaptability or versatility
If the epitrochoid system allows Rr=1 and Rr=2 cases, then engines with fewer pistons can be designed, but the rolling gears extend further from the center requiring larger overall engine dimensions
Solution Approach 1:
The patent transitions from the internal arrangement of hypotrochoid systems to an external epitrochoid configuration, effectively changing the dimensional organization of the gear system. This dimensional reorganization allows for more efficient space utilization and enables compact designs even with Rr=1 and Rr=2 configurations, as the rolling gears orbit externally rather than occupying internal space.
Data Source
AI summary
Disclosed herein is a revised version of housing wheel engine with method of hypotrochoid that patented U.S. Pat. No. 7,730,869. It keeps the main functions and also provides not only cases Rr≥3 but also cases Rr2 and Rr1, which means it has been able to develop engines as well as four pistons and two pistons, which the previous version cannot do.